Matlab work

EGME 431 Term Project

Jake Bailey, CSU Fullerton

Spring 2016

This document serves to set forth the requirements for your term project, and the criteria which such project submissions shall be judged. This outline should be the first point of inquiry for any questions you may have about your project.

The project consists of a thorough investigation, analysis, and set of design improvement sug- gestions for a simplified automobile suspension model. The dynamics of this model are rather complex: as such, I have provided a detailed derivation of the equations of motion for this system to you in a separate document. Your responsibility will be that of the analyst: use the provided dy- namic models to investigate the system’s response to typical inputs, judge these responses critically, and suggest improvements to the system.

Your project submissions shall consist of a single analysis and design report. The project report shall be turned in no later than the final class meeting of the semester, which is May 10, 2016 at 7:00 PM. As always, late assignments will not be accepted. The report shall, at a minimum, include:

• A description of your analysis methodology

• A summary of the important results from your analyses, including plots and data tables where appropriate

• A thorough defense of your analysis results, including (but not limited to):

– comparison with analytical approximations

– investigation of typical results of published investigations, and

– discussion and investigation of the approximate errors accrued in your simulations

• A succinct description of the modifications you propose to improve the performance of the system, including justification of your choices

The dynamic models which have been provided to you include both a fully coupled, non-linear model and a simplified, linearized version. It is up to you to decide which to use for each portion of the tasks outlined below. Note, however, that you should, at a minimum, simulate both models under a common input. This will server as a basis for comparison.

Your specific tasks for this project are as follows:

1. Find the response of the system to a variety of inputs, including steps, impulses, and harmonic excitation.

2. Determine the Displacement Transmissibility Ratio and Force Transmissibility Ratio of the system over a range of input frequencies.

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3. Using judgment, analytical techniques, and/or optimization methods, find a new set of sys- tem parameters (stiffnesses and damping coefficients) which will improve the response of the system to the selected inputs.

4. Finally, prepare a report which thoroughly summarizes and defends your methodology and results.

A final word on collaboration. You are encouraged to discuss your ideas and your solution approach with your classmates and colleagues. You are, however, expressly forbidden from sharing simulation data, code, spreadsheets, scripts, or the like with anyone. Two students submitting substantially similar simulation code or spreadsheets will be considered cheaters, and reprimanded as such. As always, your reports are to be wholly your own creations, and the standard plagiarism rules apply.

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